diff --git a/Directory.Build.props b/Directory.Build.props
index 94df1c1d9511..5a1e23a7d832 100644
--- a/Directory.Build.props
+++ b/Directory.Build.props
@@ -110,7 +110,7 @@
   <!-- Warnings and errors -->
   <PropertyGroup>
     <!-- Ensure API docs are available. -->
-    <NoWarn>$(NoWarn.Replace('1591', ''))</NoWarn>
+    <NoWarn>$(NoWarn.Replace('1591', ''));NETSDK1023</NoWarn>
     <NoWarn Condition=" '$(BuildingInsideVisualStudio)' == 'true' ">$(NoWarn);0105</NoWarn>
 
     <!-- For local builds, don't make missing XML docs a fatal build error, but still surface so we have visibility into undocumented APIs. -->
diff --git a/Directory.Build.targets b/Directory.Build.targets
index 1f1616124bb4..47612e6c1071 100644
--- a/Directory.Build.targets
+++ b/Directory.Build.targets
@@ -171,7 +171,7 @@
 
   <!-- Properties for Package Validation -->
   <PropertyGroup Condition="'$(ExcludeFromSourceBuild)' != 'true'">
-    <EnablePackageValidation>true</EnablePackageValidation>
+    <EnablePackageValidation>false</EnablePackageValidation>
     <DisablePackageBaselineValidation Condition="'$(IsServicingBuild)' != 'true'">true</DisablePackageBaselineValidation>
     <GenerateCompatibilitySuppressionFile>true</GenerateCompatibilitySuppressionFile>
   </PropertyGroup>
@@ -198,4 +198,11 @@
   <Import Project="eng\targets\FunctionalTestAsset.targets" Condition="'$(IsTestAssetProject)' == 'true'" />
   <Import Project="eng\targets\FunctionalTestWithAssets.targets" Condition="'$(ContainsFunctionalTestAssets)' == 'true'" />
 
+  <ItemGroup>
+    <PackageReference Include="Microsoft.Net.Compilers.Toolset"
+      Version="4.1.0-ci.final"
+      PrivateAssets="all"
+      IsImplicitlyDefined="true" />
+  </ItemGroup>
+
 </Project>
diff --git a/NuGet.config b/NuGet.config
index 46ee1c2f75f3..fa90ac9f0f63 100644
--- a/NuGet.config
+++ b/NuGet.config
@@ -8,6 +8,7 @@
     <!--  Begin: Package sources from dotnet-efcore -->
     <!--  End: Package sources from dotnet-efcore -->
     <!--End: Package sources managed by Dependency Flow automation. Do not edit the sources above.-->
+    <add key="local" value="./packages" />
     <add key="dotnet-eng" value="https://pkgs.dev.azure.com/dnceng/public/_packaging/dotnet-eng/nuget/v3/index.json" />
     <add key="dotnet-tools" value="https://pkgs.dev.azure.com/dnceng/public/_packaging/dotnet-tools/nuget/v3/index.json" />
     <add key="dotnet5" value="https://pkgs.dev.azure.com/dnceng/public/_packaging/dotnet5/nuget/v3/index.json" />
diff --git a/eng/build.ps1 b/eng/build.ps1
index 9e7fd3057ec8..a56cf94bc9e5 100644
--- a/eng/build.ps1
+++ b/eng/build.ps1
@@ -433,6 +433,7 @@ try {
             /p:Restore=$RunRestore `
             /p:Build=true `
             /clp:NoSummary `
+            /nowarn:NETSDK1023 `
             @ToolsetBuildArguments
     }
 
@@ -441,7 +442,7 @@ try {
         Remove-Item variable:global:_BuildTool -ErrorAction Ignore
         $msbuildEngine = 'vs'
 
-        MSBuild $toolsetBuildProj /p:RepoRoot=$RepoRoot @MSBuildArguments
+        MSBuild $toolsetBuildProj /p:RepoRoot=$RepoRoot /nowarn:NETSDK1023 @MSBuildArguments
     }
 
     if ($performDotnetBuild) {
@@ -449,7 +450,7 @@ try {
         Remove-Item variable:global:_BuildTool -ErrorAction Ignore
         $msbuildEngine = 'dotnet'
 
-        MSBuild $toolsetBuildProj /p:RepoRoot=$RepoRoot @dotnetBuildArguments
+        MSBuild $toolsetBuildProj /p:RepoRoot=$RepoRoot /nowarn:NETSDK1023 @dotnetBuildArguments
     }
 }
 catch {
diff --git a/eng/build.sh b/eng/build.sh
index 311734c91cff..fa86f98fe5df 100755
--- a/eng/build.sh
+++ b/eng/build.sh
@@ -369,13 +369,14 @@ if [ "$build_repo_tasks" = true ]; then
         -p:Restore=$run_restore \
         -p:Build=true \
         -clp:NoSummary \
+        -nowarn:NETSDK1023 \
         ${toolset_build_args[@]+"${toolset_build_args[@]}"}
 fi
 
 if [ "$only_build_repo_tasks" != true ]; then
     # This incantation avoids unbound variable issues if msbuild_args is empty
     # https://stackoverflow.com/questions/7577052/bash-empty-array-expansion-with-set-u
-    MSBuild $_InitializeToolset -p:RepoRoot="$repo_root" ${msbuild_args[@]+"${msbuild_args[@]}"}
+    MSBuild $_InitializeToolset -p:RepoRoot="$repo_root" -nowarn:NETSDK1023 ${msbuild_args[@]+"${msbuild_args[@]}"}
 fi
 
 ExitWithExitCode 0
diff --git a/eng/tools/GenerateFiles/Directory.Build.targets.in b/eng/tools/GenerateFiles/Directory.Build.targets.in
index c5206ec8c611..dff947b5ab82 100644
--- a/eng/tools/GenerateFiles/Directory.Build.targets.in
+++ b/eng/tools/GenerateFiles/Directory.Build.targets.in
@@ -53,6 +53,12 @@
       <DefaultRuntimeFrameworkVersion Condition=" '$(IsServicingBuild)' != 'true' AND
           '%(TargetFramework)' == '${DefaultNetCoreTargetFramework}' ">${MicrosoftAspNetCoreAppRuntimeVersion}</DefaultRuntimeFrameworkVersion>
     </KnownFrameworkReference>
+
+    <PackageReference Include="Microsoft.Net.Compilers.Toolset"
+      Version="4.1.0-ci.final"
+      PrivateAssets="all"
+      IsImplicitlyDefined="true" />
+
   </ItemGroup>
 
   <!-- Warn if the "just-built" ASP.NET Core shared framework does not exist. -->
diff --git a/packages/Microsoft.Net.Compilers.Toolset.4.1.0-ci.final.nupkg b/packages/Microsoft.Net.Compilers.Toolset.4.1.0-ci.final.nupkg
new file mode 100644
index 000000000000..2908e6c4e6a6
Binary files /dev/null and b/packages/Microsoft.Net.Compilers.Toolset.4.1.0-ci.final.nupkg differ